Transmission assembly and computer numerical control machining equipment

Abstract

According to the transmission assembly and the computer numerical control machining equipment, the transmission assembly comprises a driving wheel, a driven wheel, a synchronous conveying piece and a tensioning maintaining piece, the driven wheel can move relative to the driving wheel in the first direction, and the peripheries of the driving wheel and the driven wheel are sleeved with the inner sides of the two opposite ends of the synchronous conveying piece correspondingly; the tensioning retaining part is connected with the driven wheel and used for providing traction force or pushing force towards the side, away from the driving wheel, of the driven wheel so as to tension the synchronous conveying part. According to the synchronous conveying device, traction force or pushing force is provided through the tensioning maintaining part and the driven wheel, when the synchronous conveying part is loosened, the distance between the driven wheel and the driving wheel can be automatically adjusted so as to tension the synchronous conveying part, and the synchronous conveying part can be always kept in a tensioning state without additionally arranging a tensioning wheel and bending the synchronous conveying part; and function failure caused by slipping, tooth skipping and tooth disengagement of the transmission belt is avoided.

Description

Technical Field

[0001] The present application relates to the field of numerical control (CNC) machining, and in particular to a transmission assembly and computer numerical control (CNC) machining equipment. Background Art

[0002] Transmission components such as belts and chains are crucial components of mechanical transmission, transferring energy to the desired location to complete the desired task. Maintaining proper belt tension during operation is crucial to prevent slippage, tooth jumping, or stripping, which could lead to malfunction. Therefore, providing a synchronous pulley tensioning belt assembly that maintains belt tension has become a pressing technical challenge. Utility Model Content

[0003] The present application provides a transmission assembly for keeping a synchronous transmission member in a tensioned state and a computer numerical control processing device having the transmission assembly.

[0004] In a first aspect, an embodiment of the present application provides a transmission assembly, comprising:

[0005] driving wheel;

[0006] a driven wheel, the driven wheel being spaced apart from the driving wheel along a first direction, and the driven wheel being capable of moving relative to the driving wheel along the first direction;

[0007] A transmission belt synchronous transmission member, wherein the inner sides of opposite ends of the synchronous transmission member are respectively sleeved on the outer periphery of the driving wheel and the driven wheel;

[0008] A tensioning retainer is connected to the driven wheel, and is used to provide the driven wheel with a pulling force or a pushing force toward a side away from the driving wheel, so as to tension the synchronous transmission member.

[0009] In an optional embodiment, the tensioning retaining member is an elastic member, and the tensioning retaining member is in an elastic deformation state so that the tensioning retaining member has an elastic restoring force in the first direction. When the synchronous transmission member is relaxed, the tensioning retaining member can pull the driven wheel away from the driving wheel along the first direction under the elastic restoring force to tension the synchronous transmission member.

[0010] In an optional embodiment, the transmission assembly further includes a slider, which can slide along the first direction, and the driven wheel is provided on the slider. The driven wheel and the slider can move away from the driving wheel along the first direction under the pulling force or pushing force of the tensioning retaining member.

[0011] In an optional embodiment, the transmission assembly further includes a fixed bracket, the fixed bracket is provided with a fixed column, the slider is slidably connected to the fixed bracket, and the tensioning retainer is provided on the fixed column and connected to the slider.

[0012] In an optional embodiment, the tension retaining member is a constant force spring, the winding core of the constant force spring is fixed to the fixed column, and the free end of the constant force spring is connected to the slider.

[0013] In an optional embodiment, the number of the fixed columns is two, and the two fixed columns are spaced apart along a second direction, and the second direction is perpendicular to the first direction. The tensioning retaining member includes a first tension spring portion and a second tension spring portion, and the first tension spring portion and the second tension spring portion are arranged on opposite sides of the slider along the second direction. The two ends of the first tension spring portion are respectively connected to one of the fixed columns and one side of the slider, and the two ends of the second tension spring portion are respectively connected to another fixed column and the other side of the slider.

[0014] In an optional embodiment, the tensioning retainer further includes an intermediate connecting portion connected between the first tension spring portion and the second tension spring portion, the slider has a connecting hole located on a side of the driven wheel away from the driving wheel, and the intermediate connecting portion extends along the second direction and is inserted into the connecting hole of the slider;

[0015] The intermediate connecting portion is a non-elastic portion; or, the first tension spring portion, the intermediate connecting portion and the second tension spring portion are three parts of a tension spring.

[0016] In an optional embodiment, the transmission assembly further includes a fixed bracket, the fixed bracket is provided with two fixed columns spaced apart along the second direction, the slider further has a receiving cavity, the receiving cavity is located on a side of the driven wheel away from the driving wheel, the receiving cavity contains a receiving column, the tensioning retaining member is a torsion spring, the torsion spring is accommodated in the receiving cavity and sleeved on the receiving column, and the two free ends of the torsion spring extend out of the slider;

[0017] The two fixing posts are located between the torsion spring and the driven wheel, the inner sides of the two free ends of the torsion spring respectively abut against the two fixing posts, and the torsion spring is in an outward twisted state; or,

[0018] The torsion spring is located between the two fixed columns and the driven wheel. The outer sides of the two free ends of the torsion spring respectively abut against the two fixed columns, and the torsion spring is in an inward twisted state.

[0019] In an optional embodiment, the fixing bracket is provided with a sliding groove extending along the first direction, and the sliding block has a protruding column protruding along the third direction, and the protruding column is slidably inserted in the sliding groove.

[0020] In the second aspect, an embodiment of the present application provides a computer numerical control machining equipment, comprising a motor, a machining head and the transmission assembly described in the first aspect, wherein the motor is connected to the driving wheel, the machining head is fixedly connected to the synchronous transmission member, and the motor is used to drive the driving wheel to rotate, so as to drive the synchronous transmission member and the machining head to move along the first direction.

[0021] The transmission assembly and computer numerical control processing equipment provided by the embodiments of the present application include a driving wheel, a driven wheel, a synchronous transmission member and a tensioning retaining member. The inner sides of the opposite ends of the synchronous transmission member are respectively sleeved on the outer periphery of the driving wheel and the driven wheel. The driven wheel can move relative to the driving wheel in a first direction, and the tensioning retaining member is connected to the driven wheel and provides a pulling force or a thrust to the driven wheel. When the synchronous transmission member is loose, the tensioning retaining member can drive the driven wheel to move relative to the driving wheel, thereby tensioning the synchronous transmission member. The present application provides a pulling force or a thrust to the driven wheel by designing a tensioning retaining member. Under the action of the pulling force or the thrust, the distance between the driven wheel and the driving wheel can be automatically adjusted to tension the tension of the synchronous transmission member. Without the need to additionally set up a tensioning wheel or bend the synchronous transmission member, the synchronous transmission member can always be kept in a tensioned state, thereby avoiding slipping, tooth jumping, tooth debonding and functional failure of the synchronous transmission member, thereby improving the accuracy of the processing path of the processing head. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments.

[0023] Figure 1 This is a schematic structural diagram of a transmission assembly provided in an embodiment of the present application;

[0024] Figure 2 This is a schematic diagram of the exploded structure of a transmission assembly provided in an embodiment of the present application;

[0025] Figure 3 This is a schematic structural diagram of a transmission assembly provided by an embodiment of the present application, in which the synchronous transmission member has a second length;

[0026] Figure 4 This is a structural diagram of a slider provided in an embodiment of the present application;

[0027] Figure 5 This is a structural diagram of a fixing bracket provided in an embodiment of the present application;

[0028] Figure 6This is a structural diagram of a slide groove of a fixed bracket and a protruding column of a slider provided in an embodiment of the present application;

[0029] Figure 7 This is a structural diagram of a first tensioning retainer provided in an embodiment of the present application;

[0030] Figure 8 This is a structural diagram of a synchronous transmission member provided by an embodiment of the present application with a pulling force and a tensioning force of a first length;

[0031] Figure 9 This is a structural diagram of a synchronous transmission member with a pulling force and a tensioning force of a second length provided by an embodiment of the present application;

[0032] Figure 10 This is a schematic diagram of the first structure of the second tensioning retainer provided in an embodiment of the present application;

[0033] Figure 11 This is a schematic diagram of the exploded structure of the second tensioning retainer provided in an embodiment of the present application;

[0034] Figure 12 This is a second structural schematic diagram of the second tensioning retainer provided in an embodiment of the present application;

[0035] Figure 13 This is a third structural schematic diagram of the second tensioning retainer provided in an embodiment of the present application;

[0036] Figure 14 This is a schematic structural diagram of a third tensioning retainer provided in an embodiment of the present application;

[0037] Figure 15 This is a schematic diagram of a first structure of a transmission assembly provided by an embodiment of the present application including a third type of tensioning retainer;

[0038] Figure 16 This is a schematic diagram of the second structure of the transmission assembly provided in an embodiment of the present application including the third type of tensioning retainer;

[0039] Figure 17 It is a structural schematic diagram of a computer numerical control machining equipment provided in an embodiment of the present application.

[0040] Description of Figure Numbers:

[0041] Transmission assembly 100; driving wheel 10; driven wheel 20; synchronous transmission member 30; tensioning retaining member 40; bearing seat 50; slider 60; mounting cavity 61; fixing bracket 70; bracket inner cavity 71; fixing column 72; slide groove 73; protruding column 62; constant force spring 41; first tension spring portion 42; second tension spring portion 43; intermediate connecting portion 44; connecting hole 63; accommodating cavity 64; accommodating column 65; main side plate 74; top plate 75; first side plate 76; bottom plate 77; second side plate 78; accommodating cavity 64; accommodating column 65; movable space H; motor 200; machining head 300; first guide assembly 400; first guide rail 81; second guide rail 82; computer numerical control machining equipment 1000. DETAILED DESCRIPTION

[0042] The technical solution of this application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described in this application are only some embodiments, not all embodiments. Based on the embodiments provided in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0043] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it necessarily refer to mutually exclusive, independent, or alternative embodiments to other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0044] The terms "first," "second," and so on, in the specification and claims of this application and the accompanying drawings are used to distinguish between different objects, not to describe a specific order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a component or device comprising one or more parts is not limited to the one or more parts listed, but may optionally include one or more parts that are not listed but are inherent to the illustrated product, or one or more parts that should be present based on the described functionality.

[0045] Drive belts must maintain proper tension during operation to prevent slippage, tooth jumping, or stripping, which could lead to malfunction. However, after prolonged use, belt tension can become unstable due to wear, deformation, or material stretching caused by high temperatures. This can lead to loosening and the belt needing to be re-tensioned to maintain a stable tension. Measuring belt tension is difficult without specialized tools, making it difficult to accurately predict when tension adjustment is necessary. Manually adjusting the belt tension too high or too low can damage the mechanical transmission and its components. Therefore, maintaining the preset belt tension has become a crucial research topic in synchronous pulley design.

[0046] The common method of maintaining tension is to add an additional tensioning wheel or manually tighten the screws. This method has the following disadvantages: 1. It has many accessories and is expensive. 2. Adjusting the tension requires disassembling the device casing, which is more complicated. 3. The adjustment torque is not constant. Without professional tools for detection, it is easy to cause the tension to be too loose or too tight, and the tension cannot be quantified.

[0047] See also Figure 1 , the present application provides a transmission assembly 100 for keeping a synchronous transmission member in a tensioned state.

[0048] See also Figure 1 and Figure 2 The transmission assembly 100 includes a driving wheel 10, a driven wheel 20, a synchronous transmission member 30 and a tensioning retaining member 40.

[0049] See also Figure 1 The driven wheel 20 and the driving wheel 10 are spaced apart along the first direction Y, and the driven wheel 20 can move relative to the driving wheel 10 along the first direction Y. Take the first direction Y as the Y-axis direction as an example.

[0050] The driving wheel 10 can rotate when driven by an external force, and the external force driving method includes but is not limited to a motor, a cylinder, etc.

[0051] The axial direction of the driving wheel 10 is parallel to the axial direction of the driven wheel 20. In this embodiment, the axial directions of the driving wheel 10 and the driven wheel 20 both extend along the X-axis direction.

[0052] Further, see Figure 1 During use, the driving wheel 10 and the driven wheel 20 are both arranged on the supporting seat 50.

[0053] The inner sides of opposite ends of the synchronous transmission member 30 are respectively sleeved on the outer circumferences of the driving wheel 10 and the driven wheel 20 .

[0054] The synchronous transmission member 30 includes but is not limited to a chain, a conveyor belt, a conveyor bar, a conveyor rope, etc., which can realize synchronous transmission. In this embodiment, the synchronous transmission member 30 is described as a conveyor belt.

[0055] The synchronous transmission member 30 can be a closed endless belt or an open strip belt. The synchronous transmission member 30 surrounds the outer circumference of the driving wheel 10 and the driven wheel 20 and connects them. The transmission direction of the synchronous transmission member 30 is the first direction Y.

[0056] Optionally, transmission is achieved through friction between the inner wall of the synchronous transmission member 30 and the outer circumferential walls of the driving pulley 10 and the driven pulley 20. Furthermore, the inner wall of the synchronous transmission member 30 is provided with a first tooth pattern, and the outer circumferential walls of the driving pulley 10 and the driven pulley 20 are provided with a second tooth pattern that matches the first tooth pattern on the synchronous transmission member 30. The second tooth pattern meshes with the first tooth pattern to further increase the transmission efficiency between the driving pulley 10 and the synchronous transmission member 30, and between the synchronous transmission member 30 and the driven pulley 20.

[0057] In this embodiment, the tension of the synchronous transmission member 30 can be maintained at a preset tension, thereby achieving synchronized movement between the driving wheel 10 and the synchronous transmission member 30, and between the synchronous transmission member 30 and the driven wheel 20, thereby achieving synchronized movement between the driving wheel 10 and the driven wheel 20, forming a synchronized wheel. If the synchronous transmission member 30 becomes loose, the driving wheel 10 and the synchronous transmission member 30 will lose their synchronized movement. This will cause the position of the machining head transported by the synchronous transmission member 30 to differ from the preset position, resulting in poor trajectory accuracy of the machining head.

[0058] In this embodiment, the tensioning member 40 is connected to the driven pulley 20. The tensioning member 40 is used to provide a pulling force or a thrust to the driven pulley 20 toward the side away from the driving pulley 10. This pulling force or thrust causes the driven pulley 20 to continuously move away from the driving pulley 10. When the synchronous transmission member 30 is relaxed, the tensioning member 40 can automatically drive the driven pulley 20 toward the direction away from the driving pulley 10 to tension the synchronous transmission member 30. For example, this can maintain a preset tension on the synchronous transmission member 30. The tensioning member 40 can be located on the side of the driven pulley 20 that is close to or away from the driving pulley 10.

[0059] Specifically, when the synchronous transmission member 30 relaxes, the tensioning member 40 enables the driven pulley 20 to move relative to the driving pulley 10. For example, when the synchronous transmission member 30 is not deformed (at a first length), the spacing between the driven pulley 20 and the driving pulley 10 is maintained at a first preset spacing. The first preset spacing maintains the tension of the synchronous transmission member 30 at the first length at the preset tension. When the synchronous transmission member 30 relaxes (is stretched to a second length), the tensioning member 40 drives the driven pulley 20 away from the driving pulley 10, increasing the spacing between the driven pulley 20 and the driving pulley 10 to a second preset spacing. The second preset spacing maintains the tension of the synchronous transmission member 30 at the second length at the preset tension. In this way, the preset tension of the synchronous transmission member 30 is always maintained.

[0060] Furthermore, in this embodiment, since the tension retainer 40 is connected to the driven pulley 20 and maintains a pulling or pushing force on the driven pulley 20, the tension retainer 40 automatically adjusts the distance between the driven pulley 20 and the driving pulley 10 when the tension of the synchronous transmission member 30 changes, thereby returning the tension of the synchronous transmission member 30 to the preset tension. In other words, the transmission assembly 100 provided in this application can automatically and in real time adjust the tension of the synchronous transmission member 30 without requiring measurement.

[0061] The preset tensioning force is not specifically limited in this application. The preset tensioning force allows the driving wheel 10 and the driven wheel 20 to move synchronously without causing excessive frictional resistance between the synchronous transmission member 30 and the driving wheel 10, nor between the synchronous transmission member 30 and the driven wheel 20. Of course, this application can also achieve tensioning of the synchronous transmission member 30 without maintaining the preset tensioning force on the synchronous transmission member 30.

[0062] The transmission assembly 100 provided in the embodiment of the present application includes a driving wheel 10, a driven wheel 20, a synchronous transmission member 30 and a tensioning member 40. The inner sides of the opposite ends of the synchronous transmission member 30 are respectively sleeved on the outer periphery of the driving wheel 10 and the driven wheel 20. The driven wheel 20 can move relative to the driving wheel 10 along the first direction Y, and the tensioning member 40 connects the driven wheel 20 and provides a pulling force or a thrust to the driven wheel 20. When the synchronous transmission member 30 is loose, the tensioning member 40 can enable the driven wheel 20 to move relative to the driving wheel. 10 relative movement, thereby tensioning the synchronous transmission member 30. The present application provides a pulling force or a thrust to the driven wheel 20 by designing a tensioning retaining member 40. Then, when the synchronous transmission member 30 is loose, the distance between the driven wheel 20 and the driving wheel 10 can be automatically adjusted under the action of the pulling force or the thrust to tension the synchronous transmission member 30. Without the need to additionally set a tensioning wheel or bend the synchronous transmission member 30, the synchronous transmission member 30 can always be kept in a tensioned state, thereby avoiding the synchronous transmission member 30 from slipping, jumping teeth, or falling off teeth, thereby causing functional failure.

[0063] Optionally, the tensioning retainer 40 is an elastic member. Elastic members include, but are not limited to, metal elastic members and non-metallic elastic members. Metal elastic members include, but are not limited to, leaf springs, coil springs, torsion bar springs, and spring clips. Non-metallic elastic members include, but are not limited to, rubber springs and plastic springs. Elastic members, depending on how the elastic force is generated, include, but are not limited to, springs, tension springs, compression springs, torsion springs, and coil springs. Elastic members may also be elastic elements such as rubber bands and silicone rubber.

[0064] The tensioning member 40 is in an elastically deformed state, where the elastic deformation state includes an elastically compressed state or an elastically stretched state. Because the tensioning member 40 is in an elastically deformed state, an elastic restoring force is generated, so that the tensioning member 40 has an elastic restoring force in a first direction Y. Optionally, the first direction Y can be the direction of the elastic restoring force, or the direction of a component of the elastic restoring force. The elastic restoring force enables the tensioning member 40 to provide a pulling force or a thrust force to the driven wheel 20.

[0065] See also Figure 1 Taking the example of the tensioning member 40 providing a pulling force to the driven pulley 20, when the synchronous transmission member 30 is not deformed (its length in the first direction Y is a first length L1), the elastic restoring force of the tensioning member 40 causes the tensioning member 40 to maintain a pulling force or a thrust on the driven pulley 20. This pulling force or thrust is equal in magnitude to the force exerted by the synchronous transmission member 30 on the driven pulley 20, but opposite in direction, thereby keeping the driven pulley 20 stationary. Under the pulling force and the force exerted by the synchronous transmission member 30, the driven pulley 20 maintains a first preset distance from the driving pulley 10. The first preset distance ensures that the tension of the synchronous transmission member 30 of the first length L1 remains at the preset tension. The above process ensures that the elastic restoring force maintains the preset tension of the synchronous transmission member 30.

[0066] See also Figure 3 When the synchronous transmission member 30 undergoes tensile deformation (the length in the first direction Y is the second length L2), the force exerted by the synchronous transmission member 30 on the driven pulley 20 decreases. Under the action of the pulling force, the driven pulley 20 moves away from the driving pulley 10. The force exerted by the synchronous transmission member 30 on the driven pulley 20 gradually increases until the force exerted by the synchronous transmission member 30 on the driven pulley 20 increases to the same magnitude and opposite direction as the pulling force exerted by the tensioning member 40 on the driven pulley 20, thereby causing the driven pulley 20 to remain stationary again. At this time, the distance between the driven pulley 20 and the driving pulley 10 is the second preset distance, which ensures that the tension of the deformed synchronous transmission member 30 remains at the preset tension. The above process ensures that when the synchronous transmission member 30 relaxes, the tensioning member 40 pulls the driven pulley 20 away from the driving pulley 10 in the first direction Y under the elastic restoring force, thereby maintaining the tension of the synchronous transmission member 30 at the preset tension under the action of the elastic restoring force.

[0067] In a typical tensioning mechanism, the distance between the driving wheel 10 and the driven wheel 20 remains constant. The synchronous transmission member 30 is bent to absorb the elongation of the synchronous transmission member 30, thereby maintaining tension between the driven wheel 20 and the driving wheel 10. However, the present invention utilizes a method of moving the driven wheel 20 and maintaining the synchronous transmission member 30 straight. This not only reduces the size of the tensioning mechanism, simplifies its structure, and allows for automatic operation without the need for manual adjustment, but also maintains the straightness and tension of the synchronous transmission member 30, thereby improving the positional accuracy of the processing head transported by the synchronous transmission member 30. Furthermore, as the length of the synchronous transmission member 30 increases from the first length L1 to the second length L2, the transportable length of the feed head increases. Therefore, the present invention can convert the elongation of the synchronous transmission member 30 into the transportable length for the processing head, thereby reducing the ineffective length (the bent length) of the synchronous transmission member 30.

[0068] Optional, see Figure 1 and Figure 2 The transmission assembly 100 further includes a slider 60 , which can slide along the first direction Y. The driven wheel 20 is disposed on the slider 60 so that the driven wheel 20 can slide in the first direction Y.

[0069] See also Figure 1 and Figure 4 Optionally, the slider 60 has a mounting cavity 61. The driven wheel 20 is mounted in the mounting cavity 61 of the slider 60. The driven wheel 20 is axially rotatably connected to the slider 60 at both ends so that the driven wheel 20 can rotate under the action of the synchronous transmission member 30. The tensioning holder 40 is connected to the slider 60. When the synchronous transmission member 30 is relaxed, the driven wheel 20 and the slider 60 can move away from the driving wheel 10 along the first direction Y under the pulling force of the tensioning holder 40. In other words, the tensioning holder 40 pulls the slider 60 to move the slider 60 away from the driving wheel 10, thereby moving the driven wheel 20 in the slider 60 away from the driving wheel 10.

[0070] Optional, see Figure 1 and Figure 4 The transmission assembly 100 further includes a fixing bracket 70 . The fixing bracket 70 and the driving wheel 10 are both fixed on the supporting base 50 .

[0071] See also Figure 1 and Figure 5 , Figure 1 and Figure 5 The fixing bracket 70 in the figure is a schematic diagram of the structure after removing the plate on one side. The fixing bracket 70 has a bracket inner cavity 71. At least part of the slider 60 is disposed in the bracket inner cavity 71.

[0072] Optional, see Figure 1 and Figure 5The opening of the bracket inner cavity 71 of the fixed bracket 70 faces the driving wheel 10. The bracket inner cavity 71 forms a sliding cavity for the slider 60 along the Y-axis direction, so that the tensioning retainer 40 takes the slider 60 and the driven wheel 20 away from the driving wheel 10.

[0073] Alternatively, the fixed bracket 70 is elongated and extends along the Y-axis. The fixed bracket 70 defines a bracket cavity 71, with an opening located on one of the long sides. The driving pulley 10, the driven pulley 20, and the synchronous transmission member 30 are all disposed within the bracket cavity 71. A detailed description will be provided later.

[0074] In an alternative embodiment, see Figure 1 and Figure 5 The fixed bracket 70 is provided with a fixing post 72. Optionally, the fixing post 72 is disposed within the bracket inner cavity 71. The fixing post 72 extends along a third direction X. Furthermore, the third direction X is the axial direction of the driven wheel 20. The fixing post 72 is disposed near the bottom wall of the bracket inner cavity 71. The bottom wall of the bracket inner cavity 71 is opposite to the opening of the bracket inner cavity 71. The fixing post 72 may be cylindrical, square, or the like.

[0075] See also Figure 1 and Figure 5 The fixing column 72 may be located on a side of the slider 60 facing away from the driving wheel 10 .

[0076] See also Figure 1 and Figure 5 The slider 60 is slidably connected to the fixed bracket 70, one end of the tensioning retainer 40 is connected to the fixed column 72, and the other end of the tensioning retainer 40 is connected to the slider 60. The other end of the tensioning retainer 40 can drive the slider 60 to move toward the fixed column 72.

[0077] Optional, see Figure 1 and Figure 5 The fixing bracket 70 is provided with a sliding groove 73 extending along the first direction Y. The fixing bracket 70 has two side walls along the third direction X, each of which is provided with a sliding groove 73 extending along the first direction Y.

[0078] See also Figure 1 、 Figure 4 and Figure 5 The slider 60 has a boss 62 protruding along the third direction X. The boss 62 is inserted into the slide groove 73. The slider 60 can move along the slide groove 73 under the action of the tensioning retainer 40.

[0079] Specifically, two protruding posts 62 are provided on either side of the slider 60 along the third direction X. The two protruding posts 62 are respectively disposed within sliding grooves 73 on the two side walls. The sliding grooves 73 on the two side walls extend along the first direction Y. The slider 60 moves along the sliding grooves 73 under the pull of the tensioning retainer 40, thereby moving away from the driving wheel 10 along the first direction Y.

[0080] Optionally, in the initial state, the boss 62 abuts against the end of the slide groove 73 close to the driving wheel 10. As the synchronous transmission member 30 relaxes, the slider 60 is pulled by the tensioning retainer 40, and the boss 62 moves toward the other end of the slide groove 73.

[0081] The present application does not impose any specific restrictions on the length of the chute 73. The length of the chute 73 should be greater than half of the maximum slack length of the adjustable synchronous transmission member 30 of the transmission assembly 100. For example, if the maximum slack length of the adjustable synchronous transmission member 30 of the transmission assembly 100 is 10 mm, the length of the chute 73 should be greater than or equal to 5 mm, and the movable space between the slider 60 and the fixed post 72 should be greater than or equal to 5 mm.

[0082] Further, see Figure 6 Each slide groove 73 is slidably connected to the outer side surface of a boss 62 along its two groove walls in the second direction Z. Thus, the slide groove 73 limits the slider 60 in the second direction Z along its two groove walls in the second direction Z, allowing the slider 60 to move smoothly along the first direction Y without displacement in the second direction Z, thereby maintaining stability of the synchronous transmission member 30 in the second direction Z. The second direction Z is perpendicular to the first direction Y.

[0083] Further, see Figure 6 The boss 62 is in surface contact with the two groove walls of the slide groove 73 along the second direction Z to prevent the boss 62 from rotating in the slide groove 73. The outer side surface of the boss 62 includes at least two planes, which respectively form surface contact with the two groove walls of the slide groove 73 along the second direction Z to improve the stability of the slider 60 when moving along the first direction Y and limit it in the second direction Z.

[0084] In addition, the top surface and the bottom surface of the slider 60 along the second direction Z can be in surface contact with the two inner cavity walls of the bracket inner cavity 71 along the second direction Z and can slide relative to each other, further increasing the stability of the slider 60 in the second direction Z when sliding along the first direction Y, thereby improving the position stability of the synchronous transmission member 30 and improving the trajectory accuracy of the processing head.

[0085] Furthermore, the two side walls of the slider 60 along the third direction X can be in surface contact with the two inner cavity walls of the bracket inner cavity 71 along the third direction X and can slide relative to each other, so that the slider 60 will not be displaced in the third direction X when sliding along the first direction Y, thereby improving the position stability of the synchronous transmission member 30 and improving the trajectory accuracy of the processing head.

[0086] In an alternative embodiment, see Figure 7 , the tensioning retaining member 40 is a constant force spring 41 .

[0087] See also Figure 1 and Figure 7 Specifically, the constant force spring 41 is a coil spring. The coil core of the constant force spring 41 is fixed to the fixing post 72. The free end of the constant force spring 41 is connected to the slider 60.

[0088] See also Figure 8 and Figure 9 Within a certain range, the constant force spring 41 maintains a constant output force regardless of how much it is stretched or compressed. This ensures that the pulling force F1 exerted by the tension retaining member 40 on the slider 60 does not change with the movement of the slider 60 within a certain range. Instead, the tension retaining member 40 maintains a constant elastic restoring force, thereby maintaining the constant pulling force F1 on the slider 60 and, in turn, maintaining the tension force F2 of the synchronous transmission member 30 at a predetermined value.

[0089] Optionally, the free end of the constant force spring 41 is connected to the bottom of the slider 60 , and the free end of the constant force spring 41 extends in a direction parallel to the Y-axis to provide a relatively stable pulling force F1 for the slider 60 .

[0090] Optionally, the free end of the constant force spring 41 is connected to the middle position of the slider 60 along the second direction Z, and the free end of the constant force spring 41 extends parallel to the Y-axis direction to provide a more stable pulling force F1 for the slider 60.

[0091] In this embodiment, the tension retaining member 40 is configured as a constant-force spring 41. Due to its unique structure, the elastic restoring force of the constant-force spring 41 does not change linearly with the deformation within a certain range, but remains constant, thereby providing a stable elastic restoring force. Even when the constant-force spring 41 is pulling the slider 60, its elastic restoring force is maintained, thereby maintaining the pulling force F1 on the slider 60. This, in turn, maintains the tension F2 (preset tension) of the synchronous transmission member 30, or restores the tension F2 of the synchronous transmission member 30 to the preset tension.

[0092] Optionally, there are two fixing posts 72 , and the two fixing posts 72 are spaced apart along the second direction Z. Each fixing post 72 extends along the third direction X.

[0093] See also Figure 10 The tension retainer 40 includes a first tension spring portion 42 and a second tension spring portion 43. The first tension spring portion 42 and the second tension spring portion 43 are disposed on opposite sides of the slider 60 along the second direction Z. The first tension spring portion 42 and the second tension spring portion 43 are respectively connected between the slider 60 and two fixed posts 72. Specifically, one end of the first tension spring portion 42 is connected to one fixed post 72, and the other end of the first tension spring portion 42 is connected to one side of the slider 60. One end of the second tension spring portion 43 is connected to the other fixed post 72, and the other end of the second tension spring portion 43 is connected to the other side of the slider 60.

[0094] Optional, see Figure 10 The first tension spring portion 42 and the second tension spring portion 43 are arranged at intervals along the second direction Z.

[0095] The first tension spring portion 42 and the second tension spring portion 43 are tension springs of the same structure, material, and specifications, thereby providing the same pulling force to the slider 60. Compared to a single tension spring portion, the provision of two tension spring portions disperses the pulling force and provides a more balanced force, thereby improving the stability of the slider 60 during movement in the first direction Y and, in turn, improving the stability of the extension of the synchronous transmission member 30 in the first direction Y.

[0096] Optional, see Figure 11 The tension retaining member 40 further includes an intermediate connecting portion 44 connected between the first tension spring portion 42 and the second tension spring portion 43 .

[0097] See also Figure 11 The slider 60 has a connecting hole 63 located on the side of the driven pulley 20 facing away from the driving pulley 10. The connecting hole 63 penetrates the slider 60 along the second direction Z. The connecting hole 63 can be connected to or separated from the mounting hole. The intermediate connecting portion 44 extends along the second direction Z and is disposed within the connecting hole 63 of the slider 60.

[0098] In an alternative embodiment, see Figure 12 The intermediate connecting portion 44 is a non-elastic portion. For example, the intermediate connecting portion 44 is a cylindrical rod. The connecting hole 63 is a cylindrical hole. The slider 60 exerts a uniform tension on the first tension spring portion 42 and the second tension spring portion 43, causing the elastic deformation lengths of the first tension spring portion 42 and the second tension spring portion 43 to be the same.

[0099] When the first tension spring portion 42 and the second tension spring portion 43 are provided, the number of coils of the first tension spring portion 42 and the second tension spring portion 43 can be controlled to be the same, so as to control the elastic restoring forces on both sides of the slider 60 to be the same.

[0100] In another alternative embodiment, see Figure 11 The first tension spring portion 42, the intermediate connecting portion 44, and the second tension spring portion 43 form the three parts of a single tension spring. For example, one end of a tension spring is fixed to a fixed post 72. The other end of the tension spring first extends along the Y-axis, then passes through the connecting hole 63 of the slider 60 along the second direction Z. The portion that passes through the connecting hole 63 connects to another fixed post 72 along the Y-axis. In this way, the first tension spring portion 42, the intermediate connecting portion 44, and the second tension spring portion 43 form the three parts of a single tension spring.

[0101] In this embodiment, the tensioning retainer 40 is configured as a tension spring, which can further simplify the structure and area occupied by the tensioning retainer 40 and also simplify the installation method between the tensioning retainer 40 and the slider 60.

[0102] In other implementations, see Figure 13 Slider 60 is provided with two fixed portions on either side along the second direction Z. A connecting hole 63 extending along the second direction Z is provided near the bottom wall of fixing bracket 70. One end of a tension spring is fixed to one fixed portion on slider 60. The other end of the tension spring is first extended along the Y-axis and then passes through connecting hole 63 of fixing bracket 70 along the second direction Z. The portion that passes through connecting hole 63 is connected to the other fixed portion of slider 60 along the Y-axis. In this way, the first tension spring portion 42, the intermediate connecting portion 44, and the second tension spring portion 43 constitute the three parts of a single tension spring.

[0103] The first tension spring portion 42 and the second tension spring portion 43 are arranged along the second direction Z to avoid interference with the projection 62 of the slider 60 arranged along the third direction X.

[0104] Optional, see Figure 14 , the slider 60 also has a accommodating chamber 64. The accommodating chamber 64 is located on the side of the mounting chamber 61 (or the driven wheel 20) away from the driving wheel 10. The tensioning retainer 40 is a torsion spring. The tensioning retainer 40 (torsion spring) is accommodated in the accommodating chamber 64. In other words, the tensioning retainer 40 (torsion spring), the slider 60 and the driven wheel 20 move together relative to the driving wheel 10. Furthermore, a accommodating column 65 arranged along the third direction X is provided in the accommodating chamber 64 (torsion spring), and the torsion core of the tensioning retainer 40 (torsion spring) is sleeved in the accommodating column 65. The two free ends of the tensioning retainer 40 (torsion spring) extend out of the slider 60. Specifically, the two free ends of the tensioning retainer 40 extend out of the slider 60 on both sides of the third direction X respectively.

[0105] See also Figure 15 In this embodiment, the fixed bracket 70 can be a long strip-shaped frame extending along the Y-axis direction. The opening of the bracket inner cavity 71 is provided on a long side surface. The driving wheel 10, the driven wheel 20, and the synchronous transmission member 30 are all provided in the bracket inner cavity 71. Specifically, the fixed bracket 70 includes a main side plate 74 and a top plate 75, a first side plate 76, a bottom plate 77, and a second side plate 78 arranged around the main side plate 74. The top plate 75 and the bottom plate 77 are arranged opposite to each other along the second direction Z, the first side plate 76 and the second side plate 78 are arranged opposite to each other along the first direction Y, and the main side plate 74 is opposite to the opening of the bracket inner cavity 71.

[0106] See also Figure 15The slider 60 is disposed on a side adjacent to the first side plate 76. A movable space H is defined between the slider 60 and the first side plate 76. The length of the movable space H is not specifically limited in this application; however, the length of the movable space H should be greater than half the maximum slack length of the adjustable synchronous transmission member 30 of the transmission assembly 100. For example, if the maximum slack length of the adjustable synchronous transmission member 30 of the transmission assembly 100 is 10 mm, the length of the movable space H should be greater than or equal to 5 mm.

[0107] The fixing bracket 70 has two fixing posts 72 spaced apart along the second direction Z. The two fixing posts 72 are located on a side close to the first side plate 76 .

[0108] In an alternative embodiment, see Figure 15 The two fixing posts 72 are located between the tensioning retainer 40 (torsion spring) and the driven wheel 20. The inner sides of the two free ends of the torsion spring respectively abut against the two fixing posts, and the torsion spring is in an outward twisted state.

[0109] The inner sides of the two free ends of the tensioning retainer 40 (torsion spring) respectively abut against the two fixed columns 72. The tensioning retainer 40 (torsion spring) is in an outward twisted state. The tension angle formed by the two free ends of the tensioning retainer 40 (torsion spring) is toward the side where the driving wheel 10 is located. The tension angle between the two free ends of the tensioning retainer 40 (torsion spring) when not deformed is a first angle. After the tensioning retainer 40 (torsion spring) is installed on the slider 60 and the slider 60 is installed on the driven wheel 20, the tensioning force of the synchronous transmission member 30 drives the slider 60 to have a tendency to move toward the driving wheel 10. The two free ends of the tensioning retainer 40 (torsion spring) are blocked by the two fixed columns 72 and are stretched and deformed under the tension of the synchronous transmission member 30. The tension angle between the two free ends of the tensioning retainer 40 (torsion spring) is a second angle, which is greater than the first angle.

[0110] By designing the specifications of the torsion spring and the size of the second angle, the synchronous transmission member 30 can maintain a preset tension.

[0111] In another alternative embodiment, see Figure 16 The tensioning retainer 40 (torsion spring) is located between the two fixing posts 72 and the driven wheel 20. The outer sides of the two free ends of the tensioning retainer 40 (torsion spring) respectively abut the two fixing posts 72. The tensioning retainer 40 (torsion spring) is in an inward twisted state.

[0112] The outer sides of the two free ends of the tensioning retainer 40 (torsion spring) respectively abut against the two fixed columns 72. The tension angle formed by the two free ends of the tensioning retainer 40 (torsion spring) is away from the side where the driving wheel 10 is located. The tensioning retainer 40 (torsion spring) is in an inward twisting state. That is, the tension angle between the two free ends of the tensioning retainer 40 (torsion spring) when it is not deformed is a first angle. After the tensioning retainer 40 (torsion spring) is installed on the slider 60 and the slider 60 is installed on the driven wheel 20, the tensioning force of the synchronous transmission member 30 drives the slider 60 to move toward the driving wheel 10. The outer sides of the two free ends of the tensioning retainer 40 (torsion spring) are blocked by the two fixed columns 72 and twisted inward under the tension of the synchronous transmission member 30. The tension angle between the two free ends of the tensioning retainer 40 (torsion spring) is a third angle, which is smaller than the first angle.

[0113] By designing the specifications of the torsion spring and the size of the third angle, the synchronous transmission member 30 can maintain a preset tension. Compared to the constant force spring 41, this embodiment does not require a new mold when designing torsion springs of different specifications with different preset tensions, and the process of manufacturing the tension retaining member 40 that maintains different preset tensions is simpler.

[0114] The fixing bracket 70 in this embodiment is equivalent to the supporting base 50 in the previous embodiment. Therefore, compared with the previous embodiment, this embodiment can further simplify the structure of the transmission assembly 100 and reduce the size of the transmission assembly 100.

[0115] See also Figure 17 The embodiment of the present application further provides a computer numerical control (CNC) machining device 1000. The CNC machining device 1000 includes a motor 200, a machining head 300, and a transmission assembly 100 according to any one of the above embodiments.

[0116] The output shaft of the motor 200 is coaxially connected to the driving wheel 10. Taking the fixed bracket 70 as an elongated frame extending along the Y-axis direction as an example, the motor 200 and the driving wheel 10 are both arranged on the fixed bracket 70.

[0117] The processing head 300 is fixedly connected to the synchronous transmission member 30. The motor 200 is used to drive the driving wheel 10 to rotate, so as to drive the synchronous transmission member 30 and the processing head 300 to move along the first direction Y.

[0118] The processing head 300 includes but is not limited to a laser head, and applications of the processing head 300 include but are not limited to 3D printing, engraving, cutting, etching, etc.

[0119] The computer numerical control machining equipment 1000 provided in the embodiment of the present application drives the machining head 300 to move through the motor 200 and the transmission assembly 100. The transmission assembly 100 is designed to include a driving wheel 10, a driven wheel 20, a synchronous transmission member 30 and a tensioning retainer 40. The inner sides of the opposite ends of the synchronous transmission member 30 are respectively sleeved on the outer periphery of the driving wheel 10 and the driven wheel 20; the tensioning retainer 40 is connected to the driven wheel 20, and the tensioning retainer 40 is used to enable the driven wheel 20 to move relative to the driving wheel 10. The present application drives the driven wheel 20 to move by designing a tensioning retaining member 40, and adjusts the distance between the driven wheel 20 and the driving wheel 10 to maintain the tensioning force of the synchronous transmission member 30 at the preset tensioning force. Without the need to additionally set a tensioning wheel or bend the synchronous transmission member 30, the synchronous transmission member 30 can always be kept in a tensioned state, thereby avoiding the synchronous transmission member 30 from slipping, jumping teeth, or de-toothing, which may cause functional failure, thereby improving the accuracy of the processing path of the processing head 300.

[0120] The transmission assembly 100 designed in the present application has a simple structure, occupies a small area, and is low in cost, so the resulting computer numerical control processing equipment 1000 also has the characteristics of having fewer parts, being miniaturized, and being low in cost.

[0121] Furthermore, the CNC machining apparatus 1000 includes a first guide assembly 400. The first guide assembly 400 is configured to drive the machining head 300 to move along a first direction Y. The first guide assembly 400 includes a motor 200 and a transmission assembly 100 according to any of the aforementioned embodiments. For example, the fixed bracket 70 is a long, strip-shaped frame extending along the Y-axis.

[0122] The first guide assembly 400 further includes a first guide rail 81 provided on the top plate 75 and a second guide rail 82 provided on the bottom plate 77 . The machining head 300 moves along the first guide rail 81 and the second guide rail 82 while moving with the synchronous transmission member 30 .

[0123] Furthermore, the CNC machining apparatus 1000 includes a second guide assembly. Optionally, the structure of the second guide assembly is the same as that of the first guide assembly 400. The second guide assembly extends along the third direction X. The second conductive assembly can drive the first guide assembly 400 to move along the third direction X, thereby driving the machining head 300 to move along the third direction X, so that the machining head 300 can perform machining within the plane where the first direction Y and the third direction X lie.

[0124] Furthermore, the machining head 300 can move along the second direction Z relative to the first guide assembly 400 , so that the machining head 300 can move in three degrees of freedom.

[0125] Chain and belt drives are commonly used in long-distance mechanical transmissions. Typical tensioning methods involve adding an elastic tensioner or manually adjusting the tensioner based on actual usage. Without specialized tension testing tools, this requires significant operator experience.

[0126] The transmission assembly 100 provided in the present application includes a driving wheel 10, a driven wheel 20, a synchronous transmission member 30, a slider 60, a tensioning member 40, and a fixed bracket 70. The driving wheel 10 and the driven wheel 20 are meshed with each other through the synchronous transmission member 30. The driving wheel 10 is fixed on the motor, the driven wheel 20 is fixed on the slider 60, and the tensioning member 40 is fixed on the fixed bracket 70. The slider 60 and the fixed bracket 70 are connected by the tensioning member 40. In the initial installation state, a pre-tensioning force is applied to the tensioning member 40 to put the slider 60 in a tensioned state. The pre-tensioning force required for the synchronous transmission member 30 can be calculated according to the specifications and length of the synchronous transmission member 30, and the tensioning member 40 of the corresponding specifications can be customized. The constant tension of the tensioning member 40 is utilized to ensure that the synchronous transmission member 30 is always in a constant tension state, and the tension can be kept constant even if the synchronous transmission member 30 is slightly worn during use in the later stage.

[0127] The transmission assembly 100 provided in the present application can maintain the constant tensioning force of the synchronous transmission member 30 for a long time. The tensioning retaining member 40 tensions the driven wheel 20 to ensure stable and effective output of the mechanism performance, so that the chain drive or synchronous belt drive operates in a high-efficiency state, thereby avoiding the occurrence of failure forms such as synchronous tooth loss of step.

[0128] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application, and these improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A transmission assembly, characterized in that: include: driving wheel; a driven wheel, the driven wheel being spaced apart from the driving wheel along a first direction, and the driven wheel being capable of moving relative to the driving wheel along the first direction; A synchronous transmission member, wherein the inner sides of opposite ends of the synchronous transmission member are respectively sleeved on the outer circumferences of the driving wheel and the driven wheel; and A tensioning retainer is connected to the driven wheel, and is used to provide the driven wheel with a pulling force or a pushing force toward a side away from the driving wheel, so as to tension the synchronous transmission member.

2. The transmission assembly according to claim 1, characterized in that: The tensioning retainer is an elastic member, and the tensioning retainer is in an elastically deformed state so that the tensioning retainer has an elastic restoring force in the first direction. When the synchronous transmission member is relaxed, the tensioning retainer can pull the driven wheel away from the driving wheel along the first direction under the elastic restoring force to tension the synchronous transmission member. The elastic restoring force enables the tensioning retainer to provide the pulling force or thrust to the driven wheel.

3. The transmission assembly according to claim 2, characterized in that: The transmission assembly further includes a slider, which can slide along the first direction. The driven wheel is provided on the slider, and the driven wheel and the slider can move away from the driving wheel along the first direction under the pulling force or pushing force of the tensioning retainer.

4. The transmission assembly according to claim 3, characterized in that: The transmission assembly further comprises a fixed bracket, the fixed bracket is provided with a fixed column, the slider is slidably connected to the fixed bracket, and the tensioning retainer is provided on the fixed column and connected to the slider.

5. The transmission assembly according to claim 4, characterized in that: The tension retaining member is a constant force spring, the winding core of the constant force spring is fixed to the fixing column, and the free end of the constant force spring is connected to the slider.

6. The transmission assembly according to claim 4, characterized in that: There are two fixing columns, and the two fixing columns are arranged at intervals along a second direction, and the second direction is perpendicular to the first direction. The tensioning retaining member includes a first tension spring portion and a second tension spring portion. The first tension spring portion and the second tension spring portion are arranged on opposite sides of the slider along the second direction, and the two ends of the first tension spring portion are respectively connected to one fixing column and one side of the slider, and the two ends of the second tension spring portion are respectively connected to another fixing column and the other side of the slider.

7. The transmission assembly according to claim 6, characterized in that: The tensioning retainer further includes an intermediate connecting portion connected between the first tension spring portion and the second tension spring portion, the slider has a connecting hole located on a side of the driven wheel away from the driving wheel, and the intermediate connecting portion extends along the second direction and is inserted into the connecting hole of the slider; The intermediate connecting portion is a non-elastic portion; or, the first tension spring portion, the intermediate connecting portion and the second tension spring portion are three parts of a tension spring.

8. The transmission assembly according to claim 3, characterized in that: The transmission assembly further includes a fixed bracket, the fixed bracket being provided with two fixed columns spaced apart along the second direction, the slider further having an accommodating cavity, the accommodating cavity being located on a side of the driven wheel away from the driving wheel, the accommodating column being located in the accommodating cavity, the tensioning retaining member being a torsion spring, the torsion spring being accommodated in the accommodating cavity and sheathed around the accommodating column, and the two free ends of the torsion spring extending out of the slider; The two fixing posts are located between the torsion spring and the driven wheel, the inner sides of the two free ends of the torsion spring respectively abut against the two fixing posts, and the torsion spring is in an outward twisted state; or, The torsion spring is located between the two fixed columns and the driven wheel. The outer sides of the two free ends of the torsion spring respectively abut against the two fixed columns, and the torsion spring is in an inward twisted state.

9. The transmission assembly according to any one of claims 4 to 8, characterized in that: The fixing bracket is provided with a sliding groove extending along the first direction, and the sliding block has a convex column protruding along the third direction, and the convex column is slidably inserted in the sliding groove.

10. A computer numerical control processing equipment, characterized in that It includes a motor, a processing head and a transmission assembly as described in any one of claims 1 to 9, the motor is connected to the driving wheel, the processing head is fixedly connected to the synchronous transmission member, and the motor is used to drive the driving wheel to rotate, so as to drive the synchronous transmission member and the processing head to move along the first direction.

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